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Characterization of the CD11c Promoter Which Is Expressed in the Mouse Dendritic Cells  

Kim, Bon-Gi (Department of Microbiology and Immunology, Cancer Research Institute, Tumor Immunity Medical Research Center, Transplantation Research Institute, Xenotransplantation Research Center, Seoul National University College of Medicine)
Kim, Jung-Sik (Department of Microbiology and Immunology, Cancer Research Institute, Tumor Immunity Medical Research Center, Transplantation Research Institute, Xenotransplantation Research Center, Seoul National University College of Medicine)
Park, Chung-Gyu (Department of Microbiology and Immunology, Cancer Research Institute, Tumor Immunity Medical Research Center, Transplantation Research Institute, Xenotransplantation Research Center, Seoul National University College of Medicine)
Publication Information
IMMUNE NETWORK / v.8, no.4, 2008 , pp. 137-142 More about this Journal
Abstract
Background: CD11c, also known as integrin alpha x, is one of the optimum markers of dendritic cells. However, the regulation of the CD11c expression in mouse has not been identified yet. In this study, in order to analyze the regulation of CD11c expression, the promoter of CD11c was cloned and characterized. Methods: To identify the promoter portion, various sizes of what are considered to be CD11c promoter fragments was amplified by polymerase chain reaction (PCR), using mouse genomic DNA as a template. After sequence was obtained, these fragments were transfected into various cell lines including mouse dendritic cell lines such as JAWSII and DC2.4 and L929 as control cell line.. The promoter activity of three promoter fragments was measured and compared by luciferase activity in the transfected cells. Results: Three clones with size of 1kb, 3kb and 6kb were obtained from mouse genomic DNA. Flow cytometry analysis of JAWSII cells revealed that 52% of the cells expressed CD11c, which was confirmed by RT-PCR analysis. On the contrary, L929 and DC 2.4 cells did not express CD11c. The CD11c+ JAWSII cells were enriched from 52% to 90% with cell sorter. The comparative luciferase activity analyisis demonstrated that the region responsible for tissue specific expression was contained within -3 kb and the clone with size of 3 kb particularly showed higher luciferase activity than 6 kb and 1 kb clones. Conclusion: The CD11c promoter region containing the region responsible for tissue specificity was successfully cloned and -3 kb region showed the highest activity.
Keywords
dendritic cells; CD11c; promoter;
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